Why melting permafrost could cost $43 trillion

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Why melting permafrost could cost $43 trillion,
September 22, 2015,
By Eva Botkin-Kowacki, Staff writer,
The Christian Science Monitor,

Arctic permafrost traps much of the world's carbon dioxide and methane below the Earth's surface. But as Arctic temperatures rise, that frozen soil may not be able to hold all that gas for much longer.